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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89284a4b6002f18774842827d3b009570e05b9aad93718cb4b8dc9393ea1da94' 
  AND token = 'c5Ia2licr+uG+fLaGNXa+zlhytHaF/Cub4QaXyZxP28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}